What does the BIOS setting XHCI Pre-Boot Mode do?

Posted by Jamie Kitson on Super User See other posts from Super User or by Jamie Kitson
Published on 2012-09-26T21:12:27Z Indexed on 2012/09/26 21:40 UTC
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bios

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usb-3

I have a BIOS setting called XHCI Pre-Boot Mode. If I have this enabled USB devices which aren't plugged in at boot are never recognised, if I set it to Disabled then USB devices work normally. The brief BIOS description says "Enable this option if you need USB3.0 support in DOS." Which I don't, but it also says "Please note that XHCI controller will be disabled if you set this item as Disabled." So does that mean that USB3 is disabled with this option? Here's a picture of the screen:

http://www.flickr.com/photos/jamiekitson/8017563004/

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